What is Country Music?

Ken Burns is planning to do a documentary called country music. Ken Burns plans to explore the question "what is country music"
"For over a century , country music has been a pivotal force in Americian culture expressing hopes, joys , fears and hardships of everyday people in song."
After seeing Kens Burns miniseries on the history of baseball and the civil war I know this is going to be a fantastic and insiteful.